锻压技术

铝合金型材拉弯有限元模拟

英文标题：Finite element simulation of stretch bending on aluminum alloy extrusions

关键词：有限元模拟拉弯型材 ABAQUS/显示

分类号：

出版年,卷(期):页码：2015,40(4):54-59

摘要：

型材拉弯成形过程模拟属于高度非线性准静态问题，选择动力显示模块进行数值模拟时，需要考虑模拟分析步时间的敏感性。针对通用的型材拉弯工艺，在模拟分析步时间的敏感性分析基础上，采用ABAQUS/Explicit模块，建立了型材拉弯成形的准静态分析有限元模型。并采用ABAQUS/Standard模块分析预测回弹、侧壁厚度和截面畸变。为验证模拟方法的有效性，采用A-7B数控拉弯成形机完成2024-O铝合金Z型截面型材拉弯试验，测量试验件的回弹量、厚度和截面畸变情况。试验与模拟结果对比表明：补拉伸量对回弹量、厚度和截面畸变的影响趋势一致，其中，回弹量和厚度的平均相对误差分别为13.74%，1.66%。建立的模型能有效地应用于铝合金型材拉弯成形模拟。

The issue of simulation on stretch bending process of aluminum alloy extrusions is one of the problems in highly nonlinear quasi-static fields. When the explicit dynamics procedure is applied to quasi-static problems, the sensitivity of time on simulation analysis step is required to consider specially. Based on it, FE shell model of quasi-static analysis on stretch bending was established by ABAQUS/Explicit module for general stretch bending process. Then the springback，side-wall thickness and cross-section distortion were analyzed and predicted by static analysis with ABAQUS/Standard. An experiment of stretch bending on Al-2024-O extrusions with Z-section was carried out by A-7B CNC stretch bending forming machine,and the effectiveness of simulation was verified. The springback value, thickness and distortion of cross-section of parts were measured,and compared with the simulation results. The experiment results show the influences of post-stretching strain on the springback value, minimum thickness and cross-section distortion are coincide with the simulation results. And the average relative errors of springback and thickness are 13.74% and 1.66% respectively. It is demonstrated that the established model can be effectively applied to simulation of stretch bending of aluminum alloy.

基金项目：

国家自然科学基金资助项目(51275420)；航空科学基金资助项目(2008ZE53037)

吴静明（1976-），男，本科，工程师

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